Controlled mono- and double-Heck reaction catalyzed by a dicarbene dipalladium complex
作者:Yunfei Li、Gang Liu、Changsheng Cao、Shuzhan Wang、Yuling Li、Guangsheng Pang、Yanhui Shi
DOI:10.1016/j.tet.2013.05.030
日期:2013.7
phosphine-free mono- and double-Heck reaction of terminal olefins with electron-deficient and electron-rich aryl halides (iodides and bromides) is described. These reactions are catalyzed by the dicarbene dipalladium complex 1 by controlling the stoichiometry of the aryl halide and the olefine, the loading of the palladium catalyst, as well as using different base, and with or without additive. The procedure
描述了末端烯烃与缺电子和富电子的芳基卤化物(碘化物和溴化物)的无膦单-和双-Heck反应。通过控制芳基卤化物和烯烃的化学计量,钯催化剂的负载,以及使用不同的碱,有或没有添加剂,二碳二烯二钯配合物1催化这些反应。双-Heck反应的方法允许末端烯烃的β,β-二芳基化和β,β′-二芳基化,并以良好或优异的产率提供三取代的烯烃。